title: Purification and chemical properties of two 1,3;1,4-beta-glucan endohydrolases from germinating barley.
abstract: Two 1,3;1,4-beta-glucan endohydrolases have been purified from extracts of germinating barley by ammonium sulphate precipitation, ion-exchange and gel filtration chromatography. Both enzymes are monomeric, basic proteins. Enzyme I has a molecular weight of 28000 and an isoelectric point of 8.5, while enzyme II has a molecular weight of 33000 and an isoelectric point greater than 10. Enzyme II is a glycoprotein containing 3.6% carbohydrate, of which three residues are probable N-acetylglucosamine, but enzyme I contains only traces of associated carbohydrate. The amino acid compositions of the two 1,3;1,4-beta-glucan endohydrolases are similar and the cross-reactivity of antibodies raised against the purified enzymes suggests that they share common antigenic determinants.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D002241:Carbohydrates / Q000032:analysis; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D006026:Glycoside Hydrolases / Q000302:isolation & purification*; D005779:Immunodiffusion; D008970:Molecular Weight; D010944:Plants / Q000201:enzymology*
chemical_list: D000596:Amino Acids; D002241:Carbohydrates; D006026:Glycoside Hydrolases; C028020:licheninase